比较老的代码。


/usr/include/c++/8/cstdlib:144:11: error: ‘::calloc’ has not been declared
   using ::calloc;
           ^~~~~~
/usr/include/c++/8/cstdlib:148:11: error: ‘::getenv’ has not been declared
   using ::getenv;
           ^~~~~~
/usr/include/c++/8/cstdlib:151:11: error: ‘::malloc’ has not been declared
   using ::malloc;
           ^~~~~~
/usr/include/c++/8/cstdlib:164:11: error: ‘::realloc’ has not been declared
   using ::realloc;
           ^~~~~~~
In file included from /home/a/demo1/code1/terrain/terrain.cpp:15:
/usr/include/c++/8/stdlib.h:59:12: error: ‘std::calloc’ has not been declared
using std::calloc;
            ^~~~~~
/usr/include/c++/8/stdlib.h:62:12: error: ‘std::getenv’ has not been declared
using std::getenv;
            ^~~~~~
/usr/include/c++/8/stdlib.h:65:12: error: ‘std::malloc’ has not been declared
using std::malloc;
            ^~~~~~
/usr/include/c++/8/stdlib.h:73:12: error: ‘std::realloc’ has not been declared
using std::realloc;
            ^~~~~~~
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